diff --git a/test/vvenc_unit_test/vvenc_unit_test.cpp b/test/vvenc_unit_test/vvenc_unit_test.cpp
index 726ecde5..6aa08c9c 100644
--- a/test/vvenc_unit_test/vvenc_unit_test.cpp
+++ b/test/vvenc_unit_test/vvenc_unit_test.cpp
@@ -216,8 +216,8 @@ static bool check_fastInvCore( TCoeffOps* ref, TCoeffOps* opt, unsigned num_case
   {
     // Clamp lines down to the next multiple of four when generating
     // reducedLines to avoid existing x86 implementations over-writing.
-    unsigned lines        = 1 << rng.get( 2, 6 );
-    unsigned reducedLines = std::min( 32u, rng.get( 4u, lines, 4 ) );
+    unsigned lines        = 1 << rng.get( 1, 6 );
+    unsigned reducedLines = lines == 2 ? lines : std::min( 32u, rng.get( 4u, lines, 4 ) );
     unsigned cutoff       = rng.get( 4, trSize, 4 );  // Cutoff must be a non-zero multiple of four.
     if( !check_one_fastInvCore( ref, opt, idx, trSize, lines, reducedLines, cutoff, g, t ) )
     {
@@ -239,8 +239,8 @@ static bool check_fastFwdCore_2D( TCoeffOps* ref, TCoeffOps* opt, unsigned num_c
   {
     // Clamp line down to the next multiple of four when generating reducedLine
     // to avoid existing x86 implementations over-writing.
-    unsigned line        = 1 << rng.get( 2, 6 );
-    unsigned reducedLine = std::min( 32u, rng.get( 4u, line, 4 ) );
+    unsigned line        = 1 << rng.get( 1, 6 );
+    unsigned reducedLine = line == 2 ? 2 : std::min( 32u, rng.get( 4u, line, 4 ) );
     unsigned cutoff      = rng.get( 4, trSize, 4 );  // Cutoff must be a non-zero multiple of four.
     unsigned shift       = rng.get( 1, 16 );          // Shift must be at least one to avoid UB.
     if( !check_one_fastFwdCore_2D( ref, opt, idx, trSize, line, reducedLine, cutoff, shift, g, t ) )